The Persona series has reportedly sold over 15 million copies.
In an investor's report, Sega Sammy says that between March 2020 and the end of the fiscal year in March 2021, the fan-favourite franchise has sold almost two million copies.
The main Megami Tensei series - from which Persona is a spin-off, of course - has sold 17.7 million copies, although Sega Sammy points out that these figures also include pachislot and pachinko machines, too.